Lester O Hedges and Juan P Garrahan 2007 J. Phys.: Condens. Matter 19 205124 doi:10.1088/0953-8984/19/20/205124
Lester O Hedges and Juan P Garrahan
Show affiliationsWe apply the concept of dynamic propensity to a simple kinetically constrained model of glass formers, the two-vacancy assisted triangular lattice gas, or (2)-TLG. We find that the propensity field, defined in our case as the local root-mean-square displacement averaged over the ensemble of trajectories with identical initial configurations, is a good measure of dynamical heterogeneity. This suggests a configurational origin for spatial fluctuations of the dynamics, but just as in the case of atomistic systems, we find that propensity is not correlated to any simple structural property. We show instead that certain extended clusters of particles connected to vacancies correlate well with propensity, indicating that these are the fundamental excitations of the (2)-TLG. We also discuss time correlations and the correlation between configurations within the propensity ensemble.
Issue 20 (23 May 2007)
Received 10 October 2006
Published 25 April 2007
Lester O Hedges and Juan P Garrahan 2007 J. Phys.: Condens. Matter 19 205124
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